DL 706 then DL 2398 at Atlanta
Denver → Atlanta → New York JFK
Timetable, Atlanta time
18:01DL 706 from Denver at the gate
15:16DL 2398 to New York JFK leaves the gate
21 h 15 apart on the timetable, overnight
DL 2398 leaves 21 h 15 after DL 706 arrives on the timetable: more than half a day, so not a connection we count.